CN101337135B - Low-temperature cold trap - Google Patents
Low-temperature cold trap Download PDFInfo
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- CN101337135B CN101337135B CN2008101182374A CN200810118237A CN101337135B CN 101337135 B CN101337135 B CN 101337135B CN 2008101182374 A CN2008101182374 A CN 2008101182374A CN 200810118237 A CN200810118237 A CN 200810118237A CN 101337135 B CN101337135 B CN 101337135B
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Abstract
A cryotrap which is characterized in that it includes a cabinet in which the cryotrap is located; the cryotrap includes a refrigeration system, a cold trap part and heating parts; said refrigeration system includes a first stage closed circulation system and and a second stage closed circulation system, two different refrigerants are circulated in the two stage closed circulation systems respectively; said cold trap part consists of an evaporator which is arranged in the second stage closed circulation system and provided with a plurality of evaporator pipes, and cold trap pipes are arranged in the evaporator pipes; the outer part of the evaporator is sealed by the cabinet made of organic glass sheets, heat preservation and dehumidifying materials are filled between the evaporator and the glass sheets; said heating parts include a power supply, a control chip and a plurality of heating furnace wires, each of the cold trap pipe is provided with a heating furnace wire. The present invention has solved the waste problem of refrigerant effectively, improved the heat energy transfer efficiency and reduced the cooling time, moreover, it has solved the problem of ice blocking.
Description
Technical field
The present invention relates to a kind of refrigeration plant, particularly about a kind of cryotrap that is used to capture condensable gas.
Background technology
In production processes such as drying, freeze-drying, all need to use cold-trap that condensable gas is captured or cool off recovery.Cold-trap claims condense trap again, is widely used in biochemical oil experiment, low temperature bath of liquid, multiple uses such as medicine freeze-drying and gas trapping.The refrigeration modes of cryotrap has two kinds at present: semiconductor refrigerating and liquid nitrogen refrigerating.
The refrigeration device of semiconductor cold-trap uses extraordinary semi-conducting material, and the energising back is refrigeration directly, without cold-producing medium.But semiconductor refrigerating has continuous operation, and no gyroscopic action does not have vibrations, noise during work, and the life-span is long, installs to be easy to advantage.Because it is an electric current transducing type device,, can realize high-precision temperature control again, be easy to realize remote control, program control, computer control simultaneously, be convenient to form automatic control system by automatically controlled.It is exactly that the refrigeration temperature that can reach is higher that but semiconductor refrigerating has a bigger shortcoming, minimumly generally can only reach-30 ℃, can not realize the capture fully to gas.Therefore the range of application of semiconductor refrigerating has been subjected to bigger restriction.
Liquid nitrogen is as a kind of cooling agent commonly used, and its principle is exactly that liquid nitrogen can absorb a large amount of heats in gasification, thereby the temperature of surrounding environment is reduced rapidly.Its maximum advantage is exactly that minimum temperature can reach-196 ℃, and gas can be realized capturing fully under this temperature substantially.A kind of implementation method of liquid nitrogen cold trap is that liquid nitrogen is directly sprayed in the evaporimeter of cold-trap outside, and the gasification by liquid nitrogen descends the temperature of cold-trap rapidly, to reach lower temperature.For this implementation method, carried out research extensively and profoundly abroad, existing commercial at present liquid nitrogen cryogenics cold-trap comes out.But because this method is that liquid nitrogen is directly sprayed in the evaporimeter of cold-trap outside, so the consumption of liquid nitrogen is bigger, and the cost of refrigeration is higher.And need frequently to replenish liquid nitrogen in the operating process, for operation and maintenance brings big inconvenience.
China starts late for the research and development of cryotrap, domestic at present general be the semiconductor refrigerating mode, the cryogenic temperature that can reach is higher, and the field of its application is greatly limited.The cryotrap of domestic goodsization generally only is used at high vacuum and ultra-high vacuum system, captures backflow steam and part lysate from steam flow pump, thereby extracts from the coercibility steam in the vacuum chamber.And the cryotrap that is used to test with gas trapping does not have commercial appearance as yet.
Summary of the invention
At the problems referred to above, the purpose of this invention is to provide and a kind ofly be applicable to flexible and changeable experimental situations such as outdoor long term monitoring and field assay, and the time, cryotrap that more can the instead of liquid nitrogen refrigeration far below semiconductor refrigerating.
For achieving the above object, the present invention takes following technical scheme: a kind of cryotrap is characterized in that: it comprises a casing, and described cryotrap device is placed in the described casing; Described cryotrap device comprises refrigeration system, cold-trap parts and heater block; Described refrigeration system comprises the two-stage closed circuit circulatory system, the described two-stage closed circuit circulatory system different cold-producing medium of refrigerating efficiency that circulates respectively; Described cold-trap parts are the evaporimeter that is arranged in the closed circuit circulatory system of the second level, are provided with a plurality of evaporator tubes in the described evaporimeter, are equipped with the cold-trap pipe in each described evaporator tube; Described evaporimeter outside is filled with insulation and is removed wet stock by the box sealing of poly (methyl methacrylate) plate between described evaporimeter and the described poly (methyl methacrylate) plate; Described heater block comprises power supply, control chip and many heating furnace silks, and a described heating furnace silk is set in each described cold-trap pipe.
First order closed circuit circulatory system in the described refrigeration system comprises a compressor, condenser and evaporative condenser, and compressor connects condenser, and condenser connects evaporative condenser, and evaporative condenser connects compressor.
Second level closed circuit circulatory system in the described refrigeration system comprises a compressor and evaporimeter, compressor connects the evaporative condenser of described first order closed circuit circulatory system, evaporative condenser connects evaporimeter, and evaporimeter connects compressor, and described evaporimeter outer wrap has heat preserving and insulating material.
Second level closed circuit circulatory system in the described refrigeration system comprises a compressor and evaporimeter, and compressor connects the evaporative condenser of described first order closed circuit circulatory system, and evaporative condenser connects evaporimeter, and evaporimeter connects compressor.
Described a plurality of evaporator tube comprises evaporator main organ pipe and the secondary evaporator tube that a plurality of parallel series connection communicate, the junction sealing of each described evaporator main organ pipe and secondary evaporator tube and described cold-trap pipe.
Be arranged on the interior described heating furnace silk of each described cold-trap pipe for being connected in parallel.
The refrigerating efficiency of cold-producing medium is higher than the refrigerating efficiency of cold-producing medium in the described first order closed circuit circulatory system in the closed circuit circulatory system of the described second level.
It is silica gel that described insulation removes wet stock.
The present invention is owing to take above technical scheme, and it has the following advantages: 1, the present invention with respect to liquid nitrogen refrigerating, has solved the loss problem of cold-producing medium because all cold-producing mediums all are to circulate effectively in closed circuit system.2, evaporator tube of the present invention and cold-trap pipe all adopt the copper tube chamber, can improve the efficient of thermal energy transfer, shorten temperature fall time.3, the present invention can change the temperature of cold-trap at short notice owing to the heating furnace silk by being controlled by control chip in the cold-trap tube chamber, can also solve the stifled problem of ice of cold-trap.4, the present invention is because at evaporimeter outer wrap heat preserving and insulating material, and seals in the heat-barrier material outside, makes cold-trap not be subjected to the influence of external environment in the refrigeration work process, reaches the effect of insulation dehumidifying.
Description of drawings
Fig. 1 is a general structure schematic diagram of the present invention
Fig. 2 is the schematic diagram of evaporator tube of the present invention and cold-trap pipe
Fig. 3 is the single evaporator tube of the present invention, cold-trap pipe and cross-sectional side view thereof
The structural representation of heater of the present invention during Fig. 4
The specific embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
The present invention includes one has casing, and the cryotrap device is placed in the casing.The cryotrap device comprises refrigeration system, cold-trap parts and heater block.
Refrigeration system comprises the two-stage closed circuit circulatory system, and as shown in Figure 1, the first order closed circuit circulatory system of refrigeration system comprises a stage compressor 1, condenser 3, one-level heat exchanger 5, capillary 7 and evaporative condenser 10.Condenser 3 is connected between a stage compressor 1 and the one-level heat exchanger 5; Capillary 7 is connected between one-level heat exchanger 5 and the evaporative condenser 10; One stage compressor 1 links to each other with one-level heat exchanger 5, form the first order closed circuit circulatory system of a stage compressor 1 → condenser 3 → one-level heat exchanger 5 → capillary 7 → evaporative condenser 10 → one-level heat exchanger 5 → one stage compressors 1, wherein circulation has cold-producing medium A.Second level closed circuit circulatory system comprises: split-compressor 2, oil eliminator 4, two-stage heat exchanger 6, evaporative condenser 10, capillary 8 and evaporimeter 9.Oil eliminator 4 is in parallel with split-compressor 2, two-stage heat exchanger 6 is connected between oil eliminator 4 and the evaporative condenser 10, evaporative condenser 10 is connected on the capillary 8, evaporimeter 9 is connected between capillary 8 and the two-stage heat exchanger 6, two-stage heat exchanger 6 links to each other with split-compressor 2 again, form the second level closed circuit circulatory system of split-compressor 2 → oil eliminator 4 → two-stage heat exchanger 6 → evaporative condenser 10 → capillary 8 → evaporimeter 9 → two-stage heat exchanger 6 → split-compressor 2, wherein circulation has cold-producing medium B.Wherein the cold-producing medium A in the first order closed circuit circulatory system is the cooling of the cold-producing medium B in the closed circuit circulatory system of the second level by evaporative condenser 10 gasifications.
The operation principle of refrigeration system is: the low-temp low-pressure gaseous refrigerant A from one-level heat exchanger 5 is discharged through a stage compressor 1, is compressed into the superheated vapor of HTHP.Superheated vapor is by condenser 3, and the air radiating and cooling becomes high pressure low temperature liquid towards periphery.This moment, high pressure low temperature liquid refrigerant A was through one-level heat exchanger 5, and carried out exchange heat through wherein gaseous refrigerant A simultaneously, flowed into capillary 7 and carried out the throttling step-down.The low-temp low-pressure liquid refrigerant A that obtains enters in the evaporative condenser 10, carries out heat exchange with cold-producing medium B in the closed cycle of the second level, and cold-producing medium A absorbs the heat gasification, cold-producing medium B heat release cooling.Cold-producing medium A becomes gaseous state by liquid state, is absorbed by a stage compressor 1 through one-level heat exchanger 5.So far finish first order closed cycle, be the cooling of the cold-producing medium B in the closed cycle of the second level.Low-temp low-pressure gaseous refrigerant B from two-stage heat exchanger 6 is discharged through split-compressor 2, is compressed into the superheated vapor of HTHP.The oil eliminator 4 in parallel with split-compressor 2 can make superheated vapor through oil eliminator 4 time, and it is residual to separate the pump oil that removes split-compressor 2 by oil eliminator 4, and makes residual being recovered in the split-compressor 2 of pump oil.The pure superheated vapor that obtains after separating then enters two-stage heat exchanger 6 and carries out exchange heat through wherein gaseous refrigerant B simultaneously.Isolated pump oil is residual to be got back in the split-compressor 2 through piping.The superheated vapor that comes out from two-stage heat exchanger 6 becomes high pressure low temperature liquid refrigerant B by evaporative condenser 10 radiating and coolings.High pressure low temperature liquid refrigerant B flows into capillary 8 and carries out the throttling step-down, and the low temperature low pressure liquid refrigerants B that obtains enters endothermic gasification in the evaporimeter 9, and is carried out exchange heat by the cooling material in the evaporimeter 9, reaches the purpose of cooling.Gaseous refrigerant B after the gasification is absorbed by split-compressor 2 by behind the two-stage heat exchanger 6, finishes second level closed cycle.Wherein the cold-producing medium A in the first order closed cycle is used to the cold-producing medium B cooling in the closed cycle of the second level, therefore the cooling of cold-producing medium A requires the cooling requirement far below cold-producing medium B, that is to say that the refrigerating efficiency of cold-producing medium B will be higher than the refrigerating efficiency of cold-producing medium A far away.
Cold hydrazine parts of the present invention are the evaporimeter 9 in the closed circuit circulatory system of the second level, and as shown in Figure 2, the inside of evaporimeter 9 comprises 6 evaporator main organ pipes 91～96 and 1 secondary evaporator tube 97 of parallel series connection.The cold-trap pipe passes through from evaporator tube inside.Evaporator tube 91～97 is snakelike arrangement, and parallel series connection communicates, and the sealing of the junction of each evaporator tube two ends and cold-trap pipe, can guarantee flowability and the sealing of cold-producing medium B in evaporator tube like this.The flow direction of cold-producing medium B flows to secondary evaporator tube 97 by evaporator main organ pipe 91～96 shown in arrow among the figure.The structure and material of 6 evaporator main organ pipes 91～96 is identical, is the copper pipe of different inner diameters.Evaporator main organ pipe 91～96 of the present invention is long 230 millimeters, the copper pipe that internal diameter is 3 millimeters, and secondary evaporator tube 97 is long 230 millimeters, the copper pipe that internal diameter is 6 millimeters.200 millimeters of cold-trap Guan Weichang in the evaporator main organ pipe 91～96,3 millimeters of external diameters, the copper pipe that internal diameter is 2 millimeters, 200 millimeters of the cold-trap Guan Weichang in the secondary evaporator tube 97, the copper pipe that internal diameter is 4 millimeters.Outside evaporimeter 9,, fill insulation between evaporimeter and the poly (methyl methacrylate) plate and remove wet stock, such as silica gel material, to play the effect of insulation dehumidifying by the box sealing of poly (methyl methacrylate) plate.Make evaporimeter not be subjected to the influence of external environment in the course of the work like this.
As shown in Figure 3, cover cold-trap pipe 912 in the evaporator main organ pipe 91.The external diameter of cold-trap pipe 912 must be less than the internal diameter of evaporator tube 91, so that cold-producing medium can circulate in cavity.The cold-producing medium B conducting that can circulate in the space between evaporator main organ pipe 91 and the cold-trap pipe 912 like this to carry out exchange heat with the materials that are cooled in the cold-trap pipe 912, reaches the purpose of refrigeration.The flow direction in evaporator main organ pipe 91 and cold-trap pipe 912 can be identical or different respectively for cold-producing medium B and cooled material, and its cooling-down effect does not change.
As shown in Figure 3, Figure 4, heater block of the present invention comprises heating furnace silk 913, control chip 12 and the power supply 11 that is arranged on cold-trap pipe 912 inside.Heating furnace silk 913 is used for condenser temperature is regulated, and power supply 11 is a Switching Power Supply, and control chip 12 can be a singlechip control chip, also can be the control chip that designs voluntarily.Be arranged on the interior heating furnace silk 913 of each bar cold-trap pipe for being connected in parallel, by chip 12 control and regulation temperature.And heating furnace silk 913 needs with 912 insulation of cold-trap pipe.If fully not dry by the cooling material by the cold-trap pipe, the stifled phenomenon of ice takes place in its moisture that carries in the cold-trap tube chamber, and the temperature of then regulating the heating furnace silk just can be melted to ice and blocked up.
The present invention is because every grade of closed circuit circulatory system all has a compressor and a heat exchanger, and therefore refrigeration modes of the present invention is called the double-compressor cascade refrigeration.The purpose of first order closed circuit circulatory system is not directly to lower the temperature for the material that is cooled, but as the cooler of second level closed circuit circulatory system, carries out heat exchange with cold-producing medium in the closed circuit circulatory system of the second level, creates a condensation environment.The principle of two-stage closed circuit circulatory system is roughly the same: by compressor low temperature is compressed the gaseous refrigerant compression, form the superheated vapor of HTHP, enter in the condenser; Condenser is converted into the cryogenic high pressure liquid refrigerant by heat radiation with superheated vapor; Liquid refrigerant carries out exchange heat through the evaporimeter and the material that is cooled; Liquid refrigerant evaporation becoming gaseous state absorbs the heat of material that is cooled, thereby reaches the purpose of cooling.The cold-trap parts are made up of the cold-trap pipe of major and minor evaporator tube, and each cold-trap pipe is not connected.Cooled material in the cold-trap pipe carries out exchange heat with the cold-producing medium in the evaporimeter tube chamber.Heater block is by forming by the electrothermal furnace silk of cold-trap pipe inside, and the temperature of electrothermal furnace silk is controlled by a control chip.So not only can change the temperature of cold-trap at short notice, can also in the cold-trap tube chamber of cryotrap, take place to ice when blocking up, suitably improve temperature, the solid ice gasification is discharged.
Cryotrap of the present invention, cryogenic temperature can reach-170 ℃, far below the conventional semiconductor cold-trap.Simultaneously,, can not cause loss in the course of work, just can not have the problem of constantly replenishing yet cold-producing medium because the present invention uses compound-refrigerating agent closed cycle in system of environmental protection.So just make cryotrap of the present invention compare, under the little prerequisite of refrigeration difference, greatly reduced cost with liquid nitrogen cold trap.
Claims (10)
1. cryotrap, it is characterized in that: it comprises a casing, described cryotrap device is placed in the described casing; Described cryotrap device comprises refrigeration system, cold-trap parts and heater block; Described refrigeration system comprises the two-stage closed circuit circulatory system, the described two-stage closed circuit circulatory system different cold-producing medium of refrigerating efficiency that circulates respectively; Described cold-trap parts are the evaporimeter that is arranged in the closed circuit circulatory system of the second level, are provided with a plurality of evaporator tubes in the described evaporimeter, are equipped with the cold-trap pipe in each described evaporator tube; Another box sealing that described evaporimeter outside is surrounded by poly (methyl methacrylate) plate is filled with insulation and removes wet stock between described evaporimeter and the described poly (methyl methacrylate) plate; Described heater block comprises power supply, control chip and many heating furnace silks, and a described heating furnace silk is set in each described cold-trap pipe.
2. a kind of cryotrap as claimed in claim 1, it is characterized in that: the first order closed circuit circulatory system in the described refrigeration system comprises a compressor, condenser and evaporative condenser, compressor connects condenser, and condenser connects evaporative condenser, and evaporative condenser connects compressor.
3. a kind of cryotrap as claimed in claim 1, it is characterized in that: the second level closed circuit circulatory system in the described refrigeration system comprises a compressor and evaporimeter, compressor connects the evaporative condenser of described first order closed circuit circulatory system, evaporative condenser connects evaporimeter, evaporimeter connects compressor, and described evaporimeter outer wrap has heat preserving and insulating material.
4. a kind of cryotrap as claimed in claim 2, it is characterized in that: the second level closed circuit circulatory system in the described refrigeration system comprises a compressor and evaporimeter, compressor connects the evaporative condenser of described first order closed circuit circulatory system, evaporative condenser connects evaporimeter, and evaporimeter connects compressor.
5. as claim 1 or 2 or 3 or 4 described a kind of cryotraps, it is characterized in that: described a plurality of evaporator tubes comprise evaporator main organ pipe and secondary evaporator tube that a plurality of parallel series connection communicate, the junction sealing of each described evaporator main organ pipe and secondary evaporator tube and described cold-trap pipe.
6. as claim 1 or 2 or 3 or 4 described a kind of cryotraps, it is characterized in that: be arranged on the interior described heating furnace silk of each described cold-trap pipe for being connected in parallel.
7. a kind of cryotrap as claimed in claim 5 is characterized in that: be arranged on the interior described heating furnace silk of each described cold-trap pipe for being connected in parallel.
8. as claim 1 or 2 or 3 or 4 described a kind of cryotraps, it is characterized in that: the refrigerating efficiency of cold-producing medium is higher than the refrigerating efficiency of cold-producing medium in the described first order closed circuit circulatory system in the closed circuit circulatory system of the described second level.
9. a kind of cryotrap as claimed in claim 5 is characterized in that: the refrigerating efficiency of cold-producing medium is higher than the refrigerating efficiency of cold-producing medium in the described first order closed circuit circulatory system in the closed circuit circulatory system of the described second level.
10. a kind of cryotrap as claimed in claim 1 is characterized in that: it is silica gel that described insulation removes wet stock.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101182374A CN101337135B (en) | 2008-08-11 | 2008-08-11 | Low-temperature cold trap |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008101182374A CN101337135B (en) | 2008-08-11 | 2008-08-11 | Low-temperature cold trap |
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| CN101337135A CN101337135A (en) | 2009-01-07 |
| CN101337135B true CN101337135B (en) | 2010-06-02 |
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| CN2008101182374A Expired - Fee Related CN101337135B (en) | 2008-08-11 | 2008-08-11 | Low-temperature cold trap |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375041A (en) * | 2011-09-16 | 2012-03-14 | 武汉市天虹仪表有限责任公司 | Online volatile organic matter analyzer and using method thereof |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201210927D0 (en) * | 2012-06-20 | 2012-08-01 | Oxford Instr Nanotechnology Tools Ltd | Reduction of blockages in a cryogenic refrigerator system |
| CN112684078B (en) * | 2020-12-16 | 2024-03-29 | 广东省测试分析研究所（中国广州分析测试中心） | Method for improving chromatographic peak capacity of solid-phase microextraction sample injection mode |
| CN116116035B (en) * | 2023-02-14 | 2023-11-14 | 湖北省智云冷锋环保科技有限公司 | Industrial low-temperature cold trap and temperature control method |
-
2008
- 2008-08-11 CN CN2008101182374A patent/CN101337135B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102375041A (en) * | 2011-09-16 | 2012-03-14 | 武汉市天虹仪表有限责任公司 | Online volatile organic matter analyzer and using method thereof |
| CN102375041B (en) * | 2011-09-16 | 2015-03-04 | 武汉市天虹仪表有限责任公司 | Online volatile organic matter analyzer and using method thereof |
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| Publication number | Publication date |
|---|---|
| CN101337135A (en) | 2009-01-07 |
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